Social Bookmarking web sites like http://Del.icio.us, Digg, Stumble Upon and Furl allow their users to create a set of web site content bookmarks. Submitted book marks are organized by content tags, which are arbitrary phrases or words a user can assign to the content they wish to bookmark. This gives the user a way to classify, rank and organize web site content using tags.

The most popular Social Bookmarking web site is Digg. Digg is a relatively new social bookmarking web site and has in it's short time attracted millions of members who daily add bookmarks to all sorts of web site content. Over search engines and other bots, social bookmarking web sites have an intrinsic advantage. Users will choose what content they will bookmark, unlike relying on a program to categorize and qualify content. There is an implied quality in something that someone has taken the time to select.

Users of a social bookmarking web site will read other posters bookmarks and then add them to their own bookmarks if they liked them.. You can even view RSS feeds to see what others are tagging, which is a very cool feature and is a textbook example of a very powerful viral marketing technique.

My own experience and testing shows that 3.2% of all my web site traffic come from social bookmarking web sites, off those 50% come from http://Digg.com, 20% from http://Del.icio.us and the remaining 30% come from various bookmarking sites I am a member of. These sites include Furl and Stumble Upon.

As a search engine optimizer, social bookmarking is another tool I use to promote my web sites. An example would be, introducing a new developed web site. I could wait until Google, Yahoo and MSN found my web site naturally, but that would takes weeks if not months. I could join a link exchange network and exchange links with other web site and have the search engines find me that way. But, then again I would be relying on the indexabilty of the linking web site for the search engine to find me. Or I could add a couple of bookmarks on 3 of the most popular social bookmarking web sites. These large bookmarking web sites are indexed many times a day and the search bots are only looking for new content. Have a bookmark on a social bookmarking web site and could expect to be crawled by the big 3 within hours or at the most, within days.

To successful bookmarker, you need to supply good quality original content. Content that is going to be searched for and will solve a problem the searcher has. There is no point bookmarking content that no one wants. Spamming has become a major problem, but social bookmarking is controlled by it's users. If the content you plan to bookmark is plain spam, the users of the bookmarking web site will just ignore it and move on. Your content will wither away and eventually be dropped out of the social bookmarking web site index.

If you social bookmark properly and supply good quality content, you can expect to gain dozens of quality back links as other bookmarkers, bookmark your content. This technique is a popular tool for successful search engine optimization and the best feature of social bookmarking is that it is free to use. I have not come across any social bookmarking web site that charges the user to use their facility.

Social bookmarking web sites are growing in popularity everyday. Find the ones that best fit the theme of your web site and bookmark with them. But remember, you will only succeed with bookmarking if you have content that is worth bookmarking.